Societies that have been massively traumatised have followed roughly similar patterns of adaptation and disintegration to individual trauma.
When large groups of people or nations suffer simultaneously from violence and/or social breakdown, as in war or a tsunami, symptoms of disorganization and fear as with individual trauma affect the whole population. Aggression in the service of self-protection is a common response to collective trauma, even when not appropriate or self-damaging; apathy is another common response. When action (the group action or external action?)to remediate a damaging situation is taken the group is less traumatized; when it is impossible, trauma is intensified.